The number of voters who identify themselves as Democrats has plunged to its lowest point in over two decades, according to Gallup polling.

Just 31 percent of those surveyed said they were Democrats, the analysis of numerous Gallup political polls conducted last year found.

That ties the lowest level of Democratic affiliation since the polling firm began compiling annual data in 1988. It also shows a substantial drop from just two years ago, when President Barack Obama was in the midst of his bid for the White House and 36 percent of Americans said they were Democrats.

The analysis revealed that 38 percent of Americans identify themselves as independents, tying the high from 1994, when Bill Clinton was at the halfway point of his first term and Republicans regained a majority in the House of Representatives.

Twenty-nine percent of Americans identified themselves as Republicans in 2010, a figure that has risen only slightly.